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96001

Revised 07-27-10

Section 05

Pressure Gage and Swichgage InstrumentsOPL Series 4-1/2 in. (114 mm) Diameter Dial

The OPL-series pressure Swichgage instruments are combination pressure indicating gages with adjustable low and high

limit switches. Limit switches can be wired directly to electric pilot circuits to operate alarms, shutdown or start/stop of

engines and electric motors.

Surface mount or panel mount enclosure is available for most versions. All versions feature a 4-1/2 in. (114 mm) dial for

easy viewing. Adjustable limit switches are accessible from front of the Swichgage instrument. Limit contacts have self-

cleaning motion to enhance electrical continuity.

Other versions available (see page 2): Gage-only without contacts (Murphygage instrument)

Swichgage instrument with built-in latching relay for start-stop operations.

Specifications

Case: Die cast aluminum; weatherproof.

Contacts: See Electrical page 3, for contact ratings.

Dial: 4-1/2 in. (114 mm) white on black, dual scaled psi /

kPa. Other dial configurations available. Consult fac-

tory.

Gage Accuracy: 2% for the first and last quarters of the

scale, the middle half is 1%.

Geared Movement: 302 and 304 stainless steel.

Lens: Optically clear polycarbonate.

Pointer: High visibility with a pointer calibration hub.

Process Connection:Available in 1/4 NPT and 1/2 NPT.

See Table B, page 5.

Sensing Element: Select from bronze or 316 stainless

steel bourdon tube. See Table B, page 5 for bourdon

tube/socket combinations.

Features Combination Indicating Gage and Critical

Pressure Limit Switches

High and Low Pressure Limit ContactsAreVisible and Adjustable

Panel and Surface Mount Versions

Indicating-only Murphygage Available

Latching Control Relay Versions Available

*

* Products covered by this bulletin comply with EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.

Selected configurations are third party listed. Consult factory for details.

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Product Selection InformationWARNING: Selection of the proper gage/Swichgage instrument should include con-

sideration for the service application, the medium being measured, electrical rat-

ings, hazardous area requirements and general operating conditions. Improper

selection and/or application may be detrimental to the gage/Swichgage instrument,

could cause failure in the operating system and possibly personal injury or property

damage. If in doubt consult our sales/engineering staff.

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Base Models

OPLC

OPLC, OPLCE and OPLGThe OPLC is a surface mount, indicating, pressure gage and

switch. Adjustable high and low limit, ungrounded contacts are

used to operate alarm, shutdown or start-stop circuits. Pointer clo-

sure against either of the adjustable contacts completes the pilot-

duty circuit. An SPST toggle switch is provided to override the lowlimit contact for equipment startup. Suitable for engines or electric

motors with appropriate Murphy magnetic switch or transformer

relay assembly.

The OPLCE features a panel mount square case. It has all the fea-

tures of the OPLC except the low limit contact lockout.

The OPLG is an indicating-only pressure Murphygage instrument.

Same as the OPLC except without switch (limit) contacts.

*

* Products covered by this bulletin comply with EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.

Selected configurations are third party listed. Consult factory for details.

OPLFC

OPLFC and OPLFGThe OPLFC is a panel mounting version of the OPLC. It has all of

the features of the OPLC except the low limit contact lockout. The

lockout must be done externally through the control circuit or with

the optional SA lockout. The OPLFC is typically used in control

panels such as for compressors, pumps, etc. This version can be

environmentally sealed with either the ES or OS options. Con-

tact lead termination is by pigtail wires.

The OPLFG is an indicating-only pressure Murphygage instru-

ment. Same as the OPLFC except without switch (limit) contacts

*

OPLBP

OPLBP and OPLBPEThe OPLBP is a specialized version of the OPL series designed

for start-stop operation of engines and electric motors. The pilot-

duty limit switches are connected to an internal latching control

relay for ON/OFF automation. Available for various voltages.

The OPLBPE is the same as the OPLBP except has a panel

mount square case.

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Electical Dimensions

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Options and Accessories

P4 and P6 OptionsThe P4 (was PT147) option provides a remote seal mech-

anism to protect the Swichgage instrument sensing ele-

ment from line pressures of highly viscous and mildly

corrosive fluids. Ranges 100 thru 5,000 psi (689 kPa thru

34.5 MPa) [6.9 thru 344.7 bar]. A sealed stainless steelcapillary tube, with stainless steel armor, transmits the

pressure from the diaphragm seal to the Swichgage instru-

ment. Standard capillary length is 5 ft. (1.5 m). Optional

lengths to 50 ft. (15 m) in 5 ft. (1.5 m) increments are avail-

able. Oil well lead lines and pumps with highly viscous liq-

uids are typical applications. If required, customer should

provide a pulsation dampener.

The P6 (was PT167) option is a diaphragm sealed to a 2

NPT housing which attaches directly to the pressure gage

connection. The gage sensing element and the diaphragm

chamber are filled with a silicone fluid so that pressure

against the diaphragm causes the gage to respond. Thediaphragm housing is plated machined steel. Typical appli-

cation is for oil well lead lines. Ranges 100 thru 1,000 psi

(689 kPa thru 6.8 MPa) [6.89 thru 68.9 bar]. The P4 and

P6 can be ordered as optional features to the Swichgage

or indicating-only Murphygage instrument. See How to

Order on pages 5 and 6.

Tamperproof Contact Accessory Pulsation Dampener Eliminate pointer contact flutter on pressure Swichgage

and Murphygage instruments which are subject to pul-

sating pressure from reciprocating pumps or compres-

sors.

Allow close high-low contact settings for more accuratepressure indication and equipment control.

Decrease wear on

internal geared move-

ment and increase the

life of your instrument

by eliminating exces-

sive strain and unnec-

essary pointer

movement.

Available in brass,

carbon steel and

stainless steel. Must be ordered

separately.See bulle-

tin PD-95145B.

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How to Order

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